Oil seal



March 6, 1945. PROCTER 2,370,913

OIL SEAL Original Filed Jan. 24, 1942 fizz/672501 ANTHONY PROCTER- BY g4 ATTORNEY Patented Mar. 6, 1945 OIL SEAL Anthony Procter,Newcastle-upon-Tyne 1,

Enlland Original application January 24, 1942, Serial No.

428,139. Divided and this application December 10, 1942, Serial No.468,488. vIn Great Britain February 14, 1941 lclaim.

This invention relates to oil seals,' and its object is to providedevices of this kind with a flnn base or holding portion possessingample capability of elastic recovery.

Oil seals are composed of or comprise a washer of resiliently pliablematerial, now often oilresisting synthetic rubber, held at one peripherydirectly, or in a metal casing, as a press fit in or on a machine partstationary relatively thereto, and presenting at the other periphery a,usually axially directed, sealing flange.

More particularly the object of the present invention is to provide anoil seal composed of a resilient synthetic or natural rubber (jointlyhereinafter referred to as rubber flanged sealing portion bonded to asynthetic resin base or holding portion.

By synthetic resin is meant a synthetic resinous material which onheating to a certain temperature fuses or softens, and sets, or oncooling sets, into a hard and rigid body. Suitable materials of thiskind which fuse and set irreversibly whilst still hot are for examplephenol-formaldehyde and urea-formaldehyde synthetic resins. These resinsare usually introduced into a mould in the form of a more or lessgranular powder or as tablets of compressed powder.

For the above purpose, according to the invention, an oil seal iscomposed of a resilient rubber sealing flange portion and a syntheticresin base or holding portion moulded by heat and set in contact withthe rubber sealing flange portion.

The synthetic resin may be bonded to the rubberby fusion or softeningand setting of the former in contact with the latter. However, to ensurea reliable bond between the two materials, an intertying fabric,composed for instance of a woven fabric, wire gauze or paper, orperforated sheet metal, may be embedded in the rubber and extend intoand become embedded in the fused or softened synthetic resin.

The bonding of the rubber portion of an oil seal to the synthetic resinbase or holding porresinbase or holding portion is subsequently mouldedis occupied by an annular metal piece or pieces constituting a dummy ofthe profile of the base or holding portion. On completion of themoulding and vulcanising of the rubber portion, the metal dummy isremoved from the mould 198M118 a cavity into which the synthetic resinmoulding powder is introduced and in which it is fused.

It may be convenient to press and shape the rubber portion first withouthowever vulcanising or completely vulcanising it, and to mould and setthe synthetic resin simultaneously with the vulcanisation or completionof the vulcanisation of the rubber portion. Therubber in such case beingpractically in its finished shape, it is easy to control the exactposition of the junction between the synthetic resin and the rubber; Theshaping of the rubber portion may be effected in a die other than themould in which the simultaneous curing of the rubber and synthetic resinis subsequently effected.

In the case of a one-piece or casing-less oil seal, the synthetic resinholding portion of the sealing washer is, as other one-piece oil seals.made sufliciently massive so that it can be a press fit directly in oron the machine part stationary relatively thereto. 1

A representative example of an oil seal in accordance with the inventionis illustrated on the accompanying drawing, in half axial section.

Referring to the drawing, a is the rubber sealing flange portion of aninternal oil seal, and b is a massive synthetic resin base or holdingportion thereof. The synthetic resin portion b is cast in contact withthe neck a of the rubber sealing flange portion and thus has becomebonded thereto. a is the usual garter spring.

The bond between the neck a of the rubber sealing flange portion a ofthe oil seal and the troduced into the mould in the form of fabric orpaper impregnated with synthetic resin as an' alternative to syntheticresin powder, which need then be used only at the situation where theinterlock is effected.

This is a division of application Serial Number 428,139 flled January24, 1942.

I claim:

An oil seal comprising, a flexible rubber sealing flange portion, astout holding portion. composed of moulded synthetic resin in contactwith said rubber portion, and fabric impregnated with synthetic resininterleaved with fabric impregnated with rubber and embedded in saidsynthetic. resin and extending into said rubber portion.

ANTHONY PROCTER.

